Back To The Past

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        decimal inheritance = decimal.Parse(Console.ReadLine());
        int endYear = int.Parse(Console.ReadLine());
        decimal expences = 0m;
        decimal remainingSum = 0m;
        int yearsIvan = 18;

        for (int i = 1800; i <= endYear; i++)
        {
            if (i%2==0)
            {
                if (i>1800)
                {
                    inheritance = remainingSum;
                }
                expences = 12000;
                remainingSum = inheritance - expences;
            }
            else
            {
                expences = 12000 + yearsIvan * 50;
                remainingSum = remainingSum - expences;
            }
            yearsIvan++;
        }//end of for
        if (remainingSum>=0)
        {
            Console.WriteLine($"Yes! He will live a carefree life and will have {remainingSum:f2} dollars left.");
        }
        else
        {
            Console.WriteLine($"He will need {-remainingSum:f2} dollars to survive.");
        }

    }
}